Improvement in sewing-machines



D. H. COLE S Sewing-Machines.

Patented m. 1873.

AM. PHO railmasnAPH/c g0 N. x (mean/v51: PRDOESS) UNITED STATES PATENT QFFIOE.

- DAVID H. COLES, OF NEW YORK, N. Y.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 138,381, dated April 29, 1873; application filed April 9, 1873.

To all whom it may concern:

Be it known that I, DAVID H. COLES, of the city, county, and State of New York, have invented a new and useful Improvement in Sewin g-Machines and I do hereby declare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification, in which drawing Figure 1 represents a front view of my invention. Fig. 2 is a rear view of the same. Fig. 3 is a vertical section of the same in the plane 00 m, Fig. 1.

Similar letters indicate corresponding parts.

This invention consists in combining with the needle-slide of a sewing-machine a sleeve through which said needle-slide works, the needleslide being provided with a slotted cross head having a curved groove that catches over a pin projecting from a rod which connects the sleeve with a crank on a revolving shaft, the construction being such that when the crank revolves the sleeve and the needle-slide move together during a portion of the revolution of the crank, while during other portions of said revolution the sleeve and the slide have a differential motion independent from each other. TNearly the full power of the crank is exerted upon the needle-slide by means of the slotted crosshead and connecting-rod as the power of the crank is applied near the axis or line of movement of the slide; and, furthermore, by the differential motion of the .sleeve and slide, the slack of the needle-thread is taken up as the needle recedes.

The letter A designates an ordinary horizontal shaft by which motion is given to the sewing machine. The end of the shaft is provided with a crank, B, whose pin 1) is connected with the upper end of a connectingrod, 0, which connects, by a pin or other suitable device on its lower end, with a movable sleeve, D, arranged to move up or down within the face plate E of the machine. The movable sleeve D surrounds or partly surrounds the needle slide or bar F, the latter being arranged within the movable sleeve in such a manner as to be capable of moving independently thereof, its motion being derived from the crank B through the agency of the same connecting-rod O, which imparts motion to the said sleeve, the said connecting-rod being provided at a suitable point near the middle of its length with a pin, g, which engages with a curved groove, h, extending in a horizontal direction in a crosshead, I, fixed on the needle-slide at a part where the sleeve is cut away to allow the cross-head to be connected with the rod (J and permit of its movement without striking the sleeve. The cam-groove h in the crosshead is so formed as to cause the needleslide to descend with the sleeve and to allow the crank to act with nearly its full power while the needle is driven through the work, and then to rise a little to form the loop for the shuttle to pass through while the sleeve rises in advance of the slide. The needlethread, in-being carried from the spool to the needle, is made to pass through one or more eyes, c, secured to the sleeve and through an eye, j, secured to the needle-slide, and by the difierential motion of the slide and the sleeve the eyes i and j change their posit-ion in relation to each other, and by these means a simple and effective take'up for the needlethread is obtained.

. It isobvious that by changing the form of the cam-groove h the difference in the motion of the sleeve and needle-slide can be increased or diminished, but this difference ought to be sufficient at all times to effect the take-up of the needle-thread.

' It will be readily understood that different means could be employed for imparting motion to the sleeve and needle-slide, andl do not wish to confine myself strictly to the devices shown in the drawing. It must also be remarked that the eyes i and j can be arranged in any part of the needle-slide and of the sleeve or guide; and the guide, instead of being made in the form of a tube or sleeve, could be left open on one side; or it 1. The movable sleeve D provided with heating-rod O, and cam-groove h with the one or more eyes and moved up and down in needle-slide F and sleeve or guide D, subthe face-plate by means substantially as destantially as set forth.

scribed, in combination with the needle bar DAVID H. OOLES. or slide arrrangedwithin such sleeve, as here- Witnesses: in shown, for the purpose specified. V W. HAUFF,

2. The combination of the crank B,- con- E. G. KAsTENHUBER. 

